A
Accelerometer, Simple 93
Acid Burns, Treating 126
Acetylene Gas Generator, Homemade 57
Acetylene Lamp, Lighting 401
Aerating Water in a Small Tank 241
Aeroplane, Paper, How to Make 329
Aeroplanes, Model, Equilibrator for 11
Alarm, Burglar, How to Make 368
Alarm, Callers’ Approach 87
Alarm Clock Chicken Feeder 79
Alarm Clock to Pull Up Furnace Draft 107
Alarm, Electric 94
Alarm, Electric, Door Bell and 114
Alarm, Electric Fire, How to Make 430
Alarm, Electric, That Rings Bell and Turns On Light 337
Alarm, Electric Time 433
Alarm, Fire 47, 359
Aluminum Polish 428
Aluminum, Satin Finish on 198
Aluminum Wire, Insulating 306
Ammeter, How to Make 49, 203
Amusement-Boys Representing the Centaur 173
Amusement Device—­Merry-Go-Round Thriller 209
Amusement Device—­Merry-Go-Round, To Build 359
Amusement Device—­Teeter Board.  Revolving 297
Anesthesia, Electric 445
Animals, Small, Trap for 82
Annealing Chisel Steel 362
Annunciator, How to Construct 57, 416
Aquarium, How to Make 64, 210
Arbor, Grape, How to Build 73
Arc Lamp, Homemade 132
Arc Searchlight, Self Lighting 9
Arms and Armor, Imitation: 
  Part I 235
  Part Ii 242
  Part III 248
  Part IV 263
  Part V 271
  Part VI 279
  Part VII 284
Arms, Drip Shield for 258
Arrowhead, Flint, How to Make 23
Asbestos Table Pads, Homemade 212
Athletes, Weights for, How to Make 274
Atomizer, How to Make 158
Automobile, Boys’ Homemade 402, 430
Automobile Engine, Cooling Water for 236
Automobile, Greasing the Front Wheels of 320
Automobile Headlights, Adjusting 217
Automobile, Painting 357
Automobile with Sails 326
Axle, Cart without 291

B
Babbitt Ladle, Emergency 264
Babbitt, Ladle for Melting 173
Bag, Changing, for Plate Holders 212
Bag, Sewing, How to Make 386
Bags, Paper, Use for 19
Balloon Ascension Illusion 300
Balloon, Pilot, How to Make 118
Balloons, Paper, How to Make 215
Barometer, Homemade 151
Barometer, How to Make 188
Barrel Stave Hammock 75
Barrel Stave Sled 383
Baseball, Playing with a Pocket Knife 250
Baseball Throwing Practice, Device for 312
Bath.  Shower, To Make 15
Bathtub Stopper, Substitute 429
Batteries, Connecting Up to Give Any Voltage 93
Batteries, Dry, To Obtain Cheaply 410
Batteries, Dry, To Renew 369, 378, 401
Batteries, Gravity, Why Fail 115
Battery Binding Posts, Wire Loop Connections for 449
Battery Cell.  Dry, Making 160
Battery Connections, Wire Terminals for 168
Battery, Grenet, How to Make 83
Battery Motor, Controller and Reverse for 72
Battery Motor, Reversing 405
Battery, Non-Polarizing, How to Make 151
Battery Rheostat 80, 445
Battery, Small Storage, How to Make 121